In "Who was Lucifer and how did he become the Devil?" (2007) http://www.lucifereffect.com/lucifer.htm
Philip G. Zimbardo: Quotes about Evil
Philip G. Zimbardo is American social psychologist, author of Stanford Prison Experiment. Explore interesting quotes on evil.
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                                        In his  introduction to his site on The Lucifer Effect (2007) http://www.lucifereffect.com/ 
Context: I summarize more than 30 years of research on factors that can create a "perfect storm" which leads good people to engage in evil actions. This transformation of human character is what I call the "Lucifer Effect," named after God's favorite angel, Lucifer, who fell from grace and ultimately became Satan.
Rather than providing a religious analysis, however, I offer a psychological account of how ordinary people sometimes turn evil and commit unspeakable acts.